late monday, agents spent nearly five hours at the home of petraeus' former mistress, paula broadwell, leaving early this morning with several boxes. this, after the fbi told abc news they discovered thousands of e-mails between broadwell and petraeus, detailing the affair. >> in his universe, this moral failing is unacceptable and renders him unworthy of continuing this position of responsibility for the nation. >> reporter: the affair came to light over the summer, as part of an fbi investigation that began after jill kelly received threatening e-mails she believed from broadwell. >> the fbi, that's an investigation. and they realized they had general petraeus caught up in some fashion. and that caused them to take it all the way through to see what they really had. >> reporter: officials say broadwell had classified material on her computer, which is illegal. but the fbi does not believe any of it came from petraeus. no charges have been filed against her. controversy over how the investigation was conducted has engulfed washington. members of congress want to know why the fbi and